Add text at the top of Add post.

/**
 * Notice above the text editor for Members area.
 * 
 */
function l7w_edit_form_after_title() {
    if('custom-post-type' == get_post_type()){
        echo '<h2>Text here</h2>';
    }
}
add_action( 'edit_form_after_title', 'l7w_edit_form_after_title' );